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test.html
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<!DOCTYPE html>
<html>
<head>
<meta charset='utf-8' />
<title>显示具有自定义属性的HTML聚类</title>
<meta name='viewport' content='initial-scale=1,maximum-scale=1,user-scalable=no' />
<script src='https://api.tiles.mapbox.com/mapbox-gl-js/v1.1.1/mapbox-gl.js'></script>
<link href='https://api.tiles.mapbox.com/mapbox-gl-js/v1.1.1/mapbox-gl.css' rel='stylesheet' />
<style>
body { margin:0; padding:0; }
#map { position:absolute; top:0; bottom:0; width:100%; }
</style>
</head>
<body>
<div id='map'></div>
<script>
mapboxgl.accessToken = 'pk.eyJ1Ijoibnl5anl5YW5mYXBlbmciLCJhIjoiY2p3ajU4eXI2MGdxcDQ4cGI4cHI2bHhjcSJ9.m4FzyOH_5Yo3YVnroLxk-w'
var map = new mapboxgl.Map({
container: 'map',
zoom: 0.3,
center: [0, 20],
style: 'mapbox://styles/mapbox/light-v10'
});
// map.addControl(new mapboxgl.NavigationControl());
// filters for classifying earthquakes into five categories based on magnitude
var mag1 = ["<", ["get", "mag"], 2];
var mag2 = ["all", [">=", ["get", "mag"], 2], ["<", ["get", "mag"], 3]];
var mag3 = ["all", [">=", ["get", "mag"], 3], ["<", ["get", "mag"], 4]];
var mag4 = ["all", [">=", ["get", "mag"], 4], ["<", ["get", "mag"], 5]];
var mag5 = [">=", ["get", "mag"], 5];
// colors to use for the categories
var colors = ['#fed976', '#feb24c', '#fd8d3c', '#fc4e2a', '#e31a1c'];
map.on('load', function () {
// add a clustered GeoJSON source for a sample set of earthquakes
map.addSource('earthquakes', {
"type": "geojson",
"data": "https://docs.mapbox.com/mapbox-gl-js/assets/earthquakes.geojson",
"cluster": true,
"clusterRadius": 80,
"clusterProperties": { // keep separate counts for each magnitude category in a cluster
"mag1": ["+", ["case", mag1, 1, 0]],
"mag2": ["+", ["case", mag2, 1, 0]],
"mag3": ["+", ["case", mag3, 1, 0]],
"mag4": ["+", ["case", mag4, 1, 0]],
"mag5": ["+", ["case", mag5, 1, 0]]
}
});
// circle and symbol layers for rendering individual earthquakes (unclustered points)
map.addLayer({
"id": "earthquake_circle",
"type": "circle",
"source": "earthquakes",
"filter": ["!=", "cluster", true],
"paint": {
"circle-color": ["case",
mag1, colors[0],
mag2, colors[1],
mag3, colors[2],
mag4, colors[3], colors[4]],
"circle-opacity": 0.6,
"circle-radius": 12
}
});
map.addLayer({
"id": "earthquake_label",
"type": "symbol",
"source": "earthquakes",
"filter": ["!=", "cluster", true],
"layout": {
"text-field": ["number-format", ["get", "mag"], {"min-fraction-digits": 1, "max-fraction-digits": 1}],
"text-font": ["Open Sans Semibold", "Arial Unicode MS Bold"],
"text-size": 10
},
"paint": {
"text-color": ["case", ["<", ["get", "mag"], 3], "black", "white"]
}
});
// objects for caching and keeping track of HTML marker objects (for performance)
var markers = {};
var markersOnScreen = {};
function updateMarkers() {
var newMarkers = {};
var features = map.querySourceFeatures('earthquakes');
// for every cluster on the screen, create an HTML marker for it (if we didn't yet),
// and add it to the map if it's not there already
for (var i = 0; i < features.length; i++) {
var coords = features[i].geometry.coordinates;
var props = features[i].properties;
if (!props.cluster) continue;
var id = props.cluster_id;
var marker = markers[id];
if (!marker) {
var el = createDonutChart(props);
marker = markers[id] = new mapboxgl.Marker({element: el}).setLngLat(coords);
}
newMarkers[id] = marker;
if (!markersOnScreen[id])
marker.addTo(map);
}
// for every marker we've added previously, remove those that are no longer visible
for (id in markersOnScreen) {
if (!newMarkers[id])
markersOnScreen[id].remove();
}
markersOnScreen = newMarkers;
}
// after the GeoJSON data is loaded, update markers on the screen and do so on every map move/moveend
map.on('data', function (e) {
if (e.sourceId !== 'earthquakes' || !e.isSourceLoaded) return;
map.on('move', updateMarkers);
map.on('moveend', updateMarkers);
updateMarkers();
});
});
// code for creating an SVG donut chart from feature properties
function createDonutChart(props) {
var offsets = [];
var counts = [props.mag1, props.mag2, props.mag3, props.mag4, props.mag5];
var total = 0;
for (var i = 0; i < counts.length; i++) {
offsets.push(total);
total += counts[i];
}
var fontSize = total >= 1000 ? 22 : total >= 100 ? 20 : total >= 10 ? 18 : 16;
var r = total >= 1000 ? 50 : total >= 100 ? 32 : total >= 10 ? 24 : 18;
var r0 = Math.round(r * 0.6);
var w = r * 2;
var html = '<svg width="' + w + '" height="' + w + '" viewbox="0 0 ' + w + ' ' + w +
'" text-anchor="middle" style="font: ' + fontSize + 'px sans-serif">';
for (i = 0; i < counts.length; i++) {
html += donutSegment(offsets[i] / total, (offsets[i] + counts[i]) / total, r, r0, colors[i]);
}
html += '<circle cx="' + r + '" cy="' + r + '" r="' + r0 +
'" fill="white" /><text dominant-baseline="central" transform="translate(' +
r + ', ' + r + ')">' + total.toLocaleString() + '</text></svg>';
var el = document.createElement('div');
el.innerHTML = html;
return el.firstChild;
}
function donutSegment(start, end, r, r0, color) {
if (end - start === 1) end -= 0.00001;
var a0 = 2 * Math.PI * (start - 0.25);
var a1 = 2 * Math.PI * (end - 0.25);
var x0 = Math.cos(a0), y0 = Math.sin(a0);
var x1 = Math.cos(a1), y1 = Math.sin(a1);
var largeArc = end - start > 0.5 ? 1 : 0;
return ['<path d="M', r + r0 * x0, r + r0 * y0, 'L', r + r * x0, r + r * y0,
'A', r, r, 0, largeArc, 1, r + r * x1, r + r * y1,
'L', r + r0 * x1, r + r0 * y1, 'A',
r0, r0, 0, largeArc, 0, r + r0 * x0, r + r0 * y0,
'" fill="' + color + '" />'].join(' ');
}
</script>
</body>
</html>